CN104018724B - Connecting device of prestress concrete tower section and steel tower section of combination wind power tower - Google Patents

Abstract

The invention is a combined wind power tower prestressed concrete tower section and steel tower section connection device, the steel connecting member is connected by an upper end connection flange, a connection steel cylinder section, a connection anchor flange, two cylindrical anchor steel plates, and a stiffening connection Composed of steel plates and steel anchor bolts, each part forms a whole. A vertical prestress is applied to the concrete tower section by means of a prestress applying component. The upper end of the prestressed steel strand or the prestressed anchor bolt is anchored to the upper surface of the connecting anchor flange after being stretched by post-tensioning. Stiffening plates and steel anchors are embedded in concrete. The rigidity of the connecting section is increased by stiffening the connecting steel plate, so that the stress distribution on the top of the concrete tower section is uniform. The invention can ensure that the inner space of the tower is not reduced due to the thicker wall thickness of the concrete tower, and can improve the inhomogeneity of the stress distribution at the joint of the combined tower, effectively control the crack width of the concrete tower section, and improve the strength of the combined tower. Durability and fatigue resistance are of great importance.

Description

A connection device between prestressed concrete tower section and steel tower section of combined wind power tower

technical field

The invention relates to a wind power generation tower, in particular to a connecting device for a combined wind power tower prestressed concrete tower section and a steel tower section.

Background technique

Wind energy is a clean energy with a large resource reserve, and it is also one of the new energy types that are currently being developed at home and abroad. my country's wind resources are widely distributed, and there are good wind resources in the northwest, central and eastern coastal areas. The development prospect of wind power is quite broad. At this stage, in order to solve the problems of transportation, cost, durability and service life of traditional steel towers, it has become a new choice to use concrete and steel to form concrete and steel composite structure towers. In this composite tower, the connection between the concrete tower section and the steel structure tower section is the key to ensure the safety of its structural system. In the existing wind power tower structure system, the traditional steel flange with steel transition section is generally used to connect and bolt the concrete tower section.

Due to the limitation of the rigidity of the flange itself in the traditional flange connection method, when the distance between the prestressing positions is large, the vertical stress distribution of the concrete in the lower part of the flange between two adjacent prestressed holes arranged in the ring direction Uneven, even tensile stress may appear, and there is a possibility of local cracking of the concrete on the top of the tower. The connection section is an important component of the combined structure wind power generation tower, and the safety of its use will affect the overall service life of the tower.

The traditional bolted connection generally pre-embeds the bolts inside the concrete tower, and then fixes the connection with the bolts through the bottom flange of the upper steel tower section. When the bolt is under tension in this connection, the concrete tower will be subjected to shear force, so that the concrete tower will be stressed unevenly. At the same time, under the action of wind load, the concrete cylinder is continuously subjected to tension and pressure, so its crack resistance and fatigue resistance cannot be guaranteed.

Contents of the invention

The purpose of the present invention is to solve the disadvantages of reducing the inner space of the tower tube due to the thicker concrete section of the bottom section of the existing combined structure wind power tower, and to connect the steel section and the concrete section for the consistency of the inner space of the tower tube. There is a large local concentrated force at the top of the concrete tower in the area, and the tensile stress of the concrete caused by insufficient flange stiffness, the local compressive stress is too large, and the crack width of the reinforced concrete in the concrete tower is difficult to control and meet the requirements. A combined wind power tower prestressed concrete tower section and steel tower section connection device is proposed to reduce the unevenness of the stress on the top of the concrete tower, reduce the tensile stress on the upper surface of the concrete, and avoid local compression on the top of the concrete tower. Stress makes the concrete tower section in a state of vertical compressive stress, effectively controlling the crack width of the concrete tower section, or avoiding cracking of the concrete tower section, thereby greatly improving the structural safety, durability and fatigue resistance of the composite tower structure.

The technical solution of the present invention is a combined wind power tower prestressed concrete tower section and steel tower section connection device, including a connecting steel cylinder section that is coaxial with the upper steel tower section and has a radius consistent with the radius of the upper steel tower section. A connecting anchor flange is installed at the bottom of the tube section, the radius of the inner annulus of the connecting anchor flange is consistent with the radius of the upper steel tower section, and the radius of the outer annulus of the connecting anchor flange is consistent with the radius of the lower concrete tower section; the connection The anchor flange and the lower concrete tower section are connected by two cylindrical anchor steel plates. The central axis of the two anchor steel plates is in line with the axis of the upper steel tower section. The radius of the first anchor plate is the same as the inside of the connecting anchor flange. The radius of the annulus is the same, and one end of the first anchoring plate is connected to the inner annulus of the connecting anchor flange, and the other end of the first anchoring plate is connected to the top of the lower concrete tower section, the radius of the second anchoring plate is the same as that of the connecting anchoring method The radius of the outer annulus of the flange is the same, and one end of the second anchoring steel plate is connected with the outer annulus of the anchoring flange, and the other end of the second anchoring steel plate is connected with the top of the lower concrete tower section; the first anchoring steel plate and A plurality of stiffening connecting steel plates are evenly arranged along the circumference between the second anchoring steel plates, the top edge of the stiffening connecting steel plates is connected to the connecting anchor flange, and the two sides of the stiffening connecting steel plates are respectively connected to the first anchoring steel plate and the second anchoring steel plate ; The connecting anchor flange is evenly provided with a plurality of prestressed tunnels, and a prestressing component is provided to pass through the prestressed tunnels and enter the lower concrete tower section.

The upper end of the connecting member is provided with a connecting flange for connecting with the upper steel tower through high-strength bolts, connecting the anchoring flange, two cylindrical anchoring steel plates, and the reinforced connecting steel plate and the lower concrete of the combined structure wind power tower The tower sections are connected, and the connection is reinforced by setting steel anchor bolts. After the prestressing member is tensioned, it is anchored on the upper surface of the connecting anchor flange. By introducing prestress, the concrete of the concrete tower section is in a vertically compressed state, which can effectively control the crack width of the concrete tower section, and even avoid the occurrence of cracking of the concrete tower section, greatly improving the durability and fatigue characteristics of the concrete tower tube .

The prestressing component is a steel strand or a prestressed anchor bolt.

The bottom end of the stiffened connecting steel plate is provided with an upwardly recessed groove for filling concrete to stabilize and strengthen the stiffened connecting steel plate.

Steel anchor bolts are evenly installed on the opposite plate surfaces of the first anchoring steel plate and the second anchoring steel plate. Improve the integrity, strength and stiffness of the connecting device, further improve the force transmission path, improve the stress distribution at the top of the concrete tower section, and avoid stress concentration and uneven distribution;

Steel anchor bolts are evenly installed on the plate surface of the stiffened connecting steel plate to strengthen and connect the stiffened connecting steel plate; The perforated steel bar is used to strengthen the connection and transmit the force. After the concrete is poured, a concrete tenon can be formed between the stiffened steel plate and the perforated steel bar to effectively transfer the force on the stiffened steel plate to the concrete, so as to realize the high stress state of the steel structure and Reasonable transition of low stress state of concrete.

The connecting and anchoring flange is evenly provided with a plurality of grouting holes, and concrete is filled between the two anchoring steel plates through the grouting holes.

The bottom surface of the connecting and anchoring flange is provided with anchoring steel bars extending into the lower concrete tower section. Anchor steel bars are anchored in the concrete tower to resist bending moment and shear force.

The lower concrete tower section is provided with a lower concrete tower section ring bar surrounding the side wall of the lower concrete tower section, a vertical lower concrete tower section longitudinal bar and a horizontal lower concrete tower section tie bar.

Compared with the traditional connection method in which the flange is anchored to the concrete through the anchoring steel bar, the beneficial effect of the present invention is to solve the shortcoming of reducing the internal space of the tower tube due to the thicker concrete section of the bottom section of the existing combined structure wind power tower, ensuring The consistency of the internal space of the concrete section and the steel section is convenient for the installation of instruments and equipment in the tower and the arrangement of ladders, etc., and solves the upper part of the connection area connecting the steel section and the concrete section due to the large local eccentric concentration on the top of the concrete tower. The problem of excessive local stress. Using this connection method can make the force generated by the upper steel cylinder wall transmit the force to the concrete section through the connecting anchor flange, cylindrical anchoring steel plate and stiffened connecting steel plate, so as to avoid excessive local stress and improve the mechanical performance.

Description of drawings

Fig. 1 is the connection schematic diagram that adopts this described concrete tower section and steel tower section;

Fig. 2 is a longitudinal elevation view of the connecting device according to the present invention;

Fig. 3 is a cross-sectional view of the connecting member;

Fig. 4 is the elevation view of the band longitudinal section view of the connecting device on the top of the concrete tower before the upper steel tower section is installed;

Fig. 5 is the elevation view of the strip longitudinal section view of the connecting device connecting the concrete tower section and the upper steel tower section after installing the upper steel tower section;

Fig. 6 is a schematic diagram of a combined structure of a stiffened steel plate and a steel anchor bolt;

Fig. 7 is a schematic diagram of a composite structure in which reinforcement holes are drilled in steel plates connected with stiffeners and perforated steel bars are arranged.

Detailed ways

As shown in FIG. 1 , the upper steel tower section 1 and the lower concrete tower section 3 are connected by a connecting device 2 .

As shown in Figure 2 and Figure 3, a combined wind power tower prestressed concrete tower section and steel tower section connection device, including a connecting steel cylinder coaxial with the upper steel tower section 1 and having the same radius as the upper steel tower section 1 Section 5, the top connecting flange 4 is installed on the top of the steel cylinder section, and the upper steel tower section 1 and the upper connecting flange 4 are connected by high-strength bolts 13; The radius of the inner annulus of the anchor flange 6 is consistent with the radius of the upper steel tower section 1, and the radius of the outer annulus of the connecting anchor flange 6 is consistent with the radius of the lower concrete tower section 3; the connecting anchor flange 6 and the lower concrete tower Sections 3 are connected by two cylindrical anchoring steel plates, the central axis of the two anchoring steel plates is collinear with the axis of the upper steel tower section 1, and the radius of the first anchoring steel plate 7 is the same as the radius of the inner ring surface of the connecting anchor flange 6 Consistent, and one end of the first anchoring steel plate 7 is connected with the inner ring surface of the connecting anchor flange 6, and the other end of the first anchoring steel plate 7 is connected with the top of the lower concrete tower section 3, the radius of the second anchoring steel plate 21 is connected with the connection The radius of the outer annulus of the anchoring flange 6 is consistent, and one end of the second anchoring steel plate 21 is connected to the outer annulus of the anchoring flange 6, and the other end of the second anchoring steel plate 21 is connected to the top of the lower concrete tower section 3; Between the first anchoring steel plate 7 and the second anchoring steel plate 21, a plurality of stiffening connecting steel plates 9 are evenly arranged along the circumference, and the bottom end of the stiffening connecting steel plate 9 is provided with an upwardly recessed groove 22, and the groove 22 is filled with concrete 11. The top edge of the stiffening connecting steel plate 9 is connected to the connecting anchor flange 6, and the two sides of the stiffening connecting steel plate 9 are respectively connected to the first anchoring steel plate 7 and the second anchoring steel plate 21; the connecting anchoring flange 6 is uniformly arranged There are a plurality of prestressing tunnels 17, and prestressing members 12 are provided to pass through the prestressing tunnels 17 and enter the lower concrete tower section 3. The connecting anchor flange 6 is uniformly provided with a plurality of grouting holes 18 .

Steel anchor bolts 10 are evenly installed on the opposite surfaces of the first anchoring steel plate 7 and the second anchoring steel plate 21 . The bottom surface of the connecting anchor flange 6 is provided with an anchoring steel bar 8 extending into the lower concrete tower section.

The prestressing member 12 is a steel strand.

As shown in Fig. 4 and Fig. 5, the lower concrete tower section 3 is provided with a lower concrete tower section ring bar 15 around the lower concrete tower section side wall, a vertical lower concrete tower section longitudinal bar 14 and a horizontal lower concrete tower section Lajin16.

The reinforcement of the stiffened connecting steel plate 9 can adopt two schemes, the first scheme is shown in Figure 6, and the steel anchor bolts 10 are evenly installed on the plate surface of the stiffened connecting steel plate 9; the second scheme is shown in Figure 7, the stiffened connecting steel plate The plate surface of 9 is evenly provided with piercing reinforcement hole 19, and is provided with perforated steel bar 20 in each piercing reinforcement hole 19.

Claims (8)

1. A combined wind power tower prestressed concrete tower section and steel tower section connection device, characterized in that it includes a connecting steel that is coaxial with the upper steel tower section (1) and has a radius consistent with the radius of the upper steel tower section (1) The cylinder section (5) is connected to the bottom end of the steel cylinder section (5) and the connecting anchor flange (6) is installed. The inner ring surface radius of the connecting anchor flange (6) is consistent with the radius of the upper steel tower section (1), and the connection The radius of the outer ring surface of the anchor flange (6) is consistent with the radius of the lower concrete tower section (3); the connecting anchor flange (6) and the lower concrete tower section (3) pass through two cylindrical anchor steel plates (7,21) connection, the central axis of the two anchor plates (7,21) is collinear with the axis of the upper steel tower section (1), where the radius of the first anchor plate (7) is the same as that of the connecting anchor flange (6) The inner annulus has the same radius, and one end of the first anchoring steel plate (7) is connected to the inner annulus of the connecting anchor flange (6), and the other end of the first anchoring steel plate (7) is connected to the lower concrete tower section (3) The top connection, the radius of the second anchoring steel plate (21) is consistent with the radius of the outer ring surface of the connecting anchor flange (6), and one end of the second anchoring steel plate (21) is connected to the outer ring surface of the connecting anchor flange 6, and The other end of the second anchoring steel plate (21) is connected to the top of the lower concrete tower section (3); between the first anchoring steel plate (7) and the second anchoring steel plate (21) there are a plurality of stiffened connections evenly along the circumference The steel plate (9), the top edge of the stiffening connecting steel plate (9) is connected to the connecting anchor flange (6), and the two sides of the stiffening connecting steel plate (9) are respectively connected to the first anchoring steel plate (7) and the second anchoring steel plate ( 21) Connection; the connecting anchor flange (6) is evenly provided with a plurality of prestressed tunnels (17), and a prestressed member (12) is provided to pass through the prestressed tunnels (17) and enter the lower concrete tower section ( 3). 2. The connection device between the prestressed concrete tower section and the steel tower section of the combined wind power tower according to claim 1, characterized in that, the bottom end of the stiffened connecting steel plate (9) is provided with an upwardly recessed groove (22) . 3. The connection device between the prestressed concrete tower section and the steel tower section of the combined wind power tower according to claim 1, characterized in that the plates opposite to the first anchor steel plate (7) and the second anchor steel plate (21) are respectively uniform Install steel anchors (10). 4. According to claim 1 or 2, the connecting device between the prestressed concrete tower section and the steel tower section of the combined wind power tower, is characterized in that steel anchor bolts (10) are evenly installed on the plate surface of the stiffening connecting steel plate (9) . 5. According to claim 1 or 2, the connecting device between the prestressed concrete tower section and the steel tower section of the combined wind power tower, is characterized in that, the plate surface of the stiffened connecting steel plate (9) is uniformly provided with reinforcement holes (19 ), and perforated reinforcement (20) is provided in each piercing hole (19). 6. The connection device between the prestressed concrete tower section and the steel tower section of the combined wind power tower according to claim 1, characterized in that the connecting anchor flange (6) is uniformly provided with a plurality of grouting holes (18). 7. The connection device between the prestressed concrete tower section and the steel tower section of the combined wind power tower according to claim 1, characterized in that, the bottom surface of the connecting anchor flange (6) is provided with an anchor extending into the lower concrete tower section Steel bars (8). 8. The connection device between the prestressed concrete tower section and the steel tower section of the combined wind power tower according to claim 1, characterized in that, the lower concrete tower section (3) is provided with a lower concrete tower section surrounding the side wall of the lower concrete tower section Tower section ring bars (15), vertical lower concrete tower section longitudinal bars (14) and horizontal lower concrete tower section tie bars (16).